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pH and PPM rising

I have cleaned my GH Water farm for the 3rd time and I still and have problems keeping the pH and PPM down. Right now I am running plain water in it. I started it yesterday with a pH of 6.3 and a ppm of 93. Today it is running 7.3 and 240. I have no plants in it just water. I boiled everything and made sure it was clean.